U.S. patent number 8,771,466 [Application Number 13/933,482] was granted by the patent office on 2014-07-08 for method for manufacturing an embossed sheet comprising a ply of water-soluble material.
This patent grant is currently assigned to SCA Tissue France. The grantee listed for this patent is SCA Tissue France. Invention is credited to Yoann Denis, Hubert Pfister.
United States Patent |
8,771,466 |
Denis , et al. |
July 8, 2014 |
Method for manufacturing an embossed sheet comprising a ply of
water-soluble material
Abstract
The invention proposes an embossed sheet (10) comprising at
least one ply (12) of tissue having an embossing pattern comprising
at least one series of protuberances (18) formed projecting from
one surface of the said ply (12) of tissue, and at least one ply
joined to the said at least one ply (12) of tissue and located
opposite the said surface of the ply (14) of water-soluble
material, characterized in that the ply (14) of water-soluble
material is joined to the said at least one ply (12) of tissue at
the summits (18a) of at least part of the protuberances (18). The
invention also proposes a method for manufacturing such a multi-ply
sheet (10).
Inventors: |
Denis; Yoann (Selestat,
FR), Pfister; Hubert (Rorschwihr, FR) |
Applicant: |
Name |
City |
State |
Country |
Type |
SCA Tissue France |
Bois-Colombes |
N/A |
FR |
|
|
Assignee: |
SCA Tissue France (Saint-Ouen,
FR)
|
Family
ID: |
39844042 |
Appl.
No.: |
13/933,482 |
Filed: |
July 2, 2013 |
Prior Publication Data
|
|
|
|
Document
Identifier |
Publication Date |
|
US 20130292072 A1 |
Nov 7, 2013 |
|
Related U.S. Patent Documents
|
|
|
|
|
|
|
Application
Number |
Filing Date |
Patent Number |
Issue Date |
|
|
12920776 |
|
8506756 |
|
|
|
PCT/FR2009/000231 |
Mar 4, 2009 |
|
|
|
|
Foreign Application Priority Data
|
|
|
|
|
Mar 6, 2008 [FR] |
|
|
08 51455 |
|
Current U.S.
Class: |
162/117; 264/284;
162/124; 156/219; 162/125; 162/127; 156/209 |
Current CPC
Class: |
B32B
29/06 (20130101); B32B 7/12 (20130101); D21H
27/02 (20130101); B31F 1/07 (20130101); B32B
27/10 (20130101); B32B 3/266 (20130101); B32B
27/306 (20130101); B32B 7/05 (20190101); D21H
27/30 (20130101); B31F 5/02 (20130101); B32B
3/28 (20130101); D21H 27/40 (20130101); B32B
27/12 (20130101); B32B 2307/7166 (20130101); Y10T
156/1039 (20150115); B31F 2201/0756 (20130101); B31F
2201/0761 (20130101); Y10T 428/24612 (20150115); B32B
2307/50 (20130101); B31F 2201/0787 (20130101); B31F
2201/0738 (20130101); B31F 2201/0733 (20130101); B32B
2307/726 (20130101); Y10T 156/1023 (20150115); B32B
2262/062 (20130101); B32B 2307/7265 (20130101); Y10T
428/31993 (20150401); Y10T 428/24479 (20150115); B31F
2201/0715 (20130101); B32B 2555/00 (20130101) |
Current International
Class: |
B31F
1/07 (20060101) |
Field of
Search: |
;162/109,117,123-133,158,164.1,168.1 ;428/156,172,195.1,537.5
;156/209,219 ;264/284 |
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|
Primary Examiner: Fortuna; Jose
Attorney, Agent or Firm: Drinker Biddle & Reath LLP
Parent Case Text
RELATED APPLICATION DATA
This application is a continuation application of U.S. patent
application Ser. No. 12/920,776, filed Sep. 2, 2010, now U.S. Pat.
No. 8,506,756 which is a national stage filing based on PCT
International Application No. PCT/FR2009/000231, filed on Mar. 4,
2009, which claims priority to French Application No. 0851455,
filed on Mar. 6, 2008, each of which is herein incorporated by
reference in its entirety.
Claims
The invention claimed is:
1. A method for manufacturing an embossed sheet comprising at least
one ply of tissue and at least one ply of water-soluble material,
the method comprising the steps of: embossing said at least one ply
of tissue to form protuberances on one surface of said at least one
ply of tissue; humidifying summits of the protuberances of at least
part of the protuberances; and joining said at least one ply of
water-soluble material to the summits of said at least part of the
protuberances of said at least one ply of tissue to cause a local
dissolution of the surface of the ply of water-soluble material
upon its contact with the humidified summits.
2. The method according to claim 1, wherein the summits of the
protuberances of said at least part of the protuberances are coated
with adhesive before joining the ply of water-soluble material to
said at least one ply of tissue.
3. The method according to claim 1, wherein the surface of the ply
of water-soluble material located opposite the ply of tissue is
humidified locally before joining the ply of water-soluble material
to said at least one ply of tissue.
4. The method according to claim 3, wherein said surface of the ply
of water-soluble material is humidified at the summits of the
protuberances of said at least one ply of tissue.
5. The method according to claim 1, wherein the ply of water
soluble material is embossed before its joining to said at least
one ply of tissue.
6. The method according to claim 5, wherein the ply of
water-soluble material comprises perforations and/or
micro-perforations which are produced before embossing the ply of
water-soluble material.
7. A method for manufacturing an embossed sheet comprising at least
one first ply of tissue, at least one second ply of tissue, and at
least one ply of water-soluble material arranged between said at
least one first ply of tissue and said at least one second ply of
tissue, the method comprising the steps of: embossing said at least
one first ply of tissue to form protuberances on one surface of
said at least one first ply of tissue; embossing said at least one
second ply of tissue to form protuberances on one surface of said
at least one second ply of tissue; humidifying summits of the
protuberances of at least part of the protuberances on said at
least one first ply of tissue and on said at least one second ply
of tissue; and simultaneously joining the at least one ply of
water-soluble material to said at least one first ply of tissue and
to said at least one second ply of tissue to cause a local
dissolution of the surface of the at least one ply of water-soluble
material upon its contact with the humidified summits.
Description
The invention proposes an embossed sheet comprising at least one
ply of tissue and at least one ply of water-soluble material.
The invention proposes more particularly an embossed sheet
comprising at least one ply of tissue having an embossing pattern
comprising at least one series of protuberances formed and
projecting from one surface of the said ply of tissue, and
comprising at least one ply of water-soluble material.
The ply of water-soluble material is prepared so as to form a
impermeable barrier to liquids, microorganisms such as bacteria and
viruses contained in these liquids.
The function called "impermeable" of the barrier formed by the
water-soluble ply consists here in temporarily preventing the
liquids from passing through the said ply.
Thus, the use of a ply of water-soluble material, in combination
with at least one ply of tissue, serves to obtain a product
comprising, on the one hand, the absorbent properties of the tissue
ply and, on the other, the waterproofness procured by the ply of
water-soluble material.
These properties are particularly advantageous for the use of a
paper product as a facial tissue or as bathroom tissue, because the
bacteria and/or viruses cannot be transferred to the user's
hand.
Moreover, when the paper product is used as bathroom tissue, each
of the various plies constituting the paper product is suitable for
being dispersed in the water, when the product is discarded into
the toilet, without the risk of blocking the pipes.
Document GB-B-1 185 227 describes such a paper product, for which
the ply of water-soluble material is prepared by hot extrusion and
is hot bonded to the tissue plies discharged from the extruder, so
that the tissue plies partly absorb the water-soluble material
which has not yet hardened.
However, such a manufacturing method is relatively complicated to
set up, and this document does not specifically describe the
connection between the ply of water-soluble material and each ply
of tissue.
It is the object of the invention to propose a paper product
comprising a ply of water-soluble material which is joined to at
least one ply of tissue so that the product has the usual
properties of such a paper product.
For this purpose, the invention proposes an embossed sheet of the
type described previously, characterized in that the ply of
water-soluble material is joined to the said at least one ply of
tissue at the summits of at least part of the protuberances.
According to other features of the sheet according to the
invention, taken separately or in combination: the ply of
water-soluble material is joined to the said at least one ply of
tissue by local dissolution of the ply of water-soluble material,
at the summits of the said at least part of the protuberances, to
which the ply of water-soluble material is joined; the surface of
the ply of water-soluble material is suitable for being dissolved
for the joining of the ply of water-soluble material to the said at
least one ply of tissue; the ply of water-soluble material is
suitable for being dissolved locally by a water-based liquid; the
liquid comprises water and an additive; the liquid is water; each
of the said summits of the said at least part of the protuberances
is suitable for being humidified before the joining of the ply of
tissue to the ply of water-soluble material, to cause the partial
dissolution of the ply of water-soluble material at the contact
with the said summit of the said at least part of the
protuberances; the ply of water-soluble material is joined to the
said at least one ply of tissue by adhesion of the water-soluble
material to the said summits of the said at least part of the
protuberances; the sheet comprises at least two plies of tissue
each having an embossing pattern which comprises at least one
series of protuberances oriented inwardly from the sheet and the
ply of water-soluble material is arranged between the said at least
two plies of tissue and is joined to each of the said two plies at
the summits of at least part of the protuberances of each of the
said two plies of tissue; the ply of water-soluble material is
based on an at least partially hydrolysed polyvinyl alcohol; the
ply of water-soluble material is based on an at least 90%
hydrolysed polyvinyl alcohol; the thickness of the ply of
water-soluble material is less than 25 .mu.m; the ply of
water-soluble material is embossed and comprises at least one
series of protuberances; the ply of water-soluble material
comprises perforations and/or micro-perforations.
It is a further object of the invention to propose a method for
manufacturing an embossed sheet according to the invention,
comprising at least one ply of tissue and at least one ply of
water-soluble material,
characterized in that it consists in embossing at least one ply of
tissue to form protuberances on one surface of the said at least
one ply of tissue and then in joining the ply of water-soluble
material to the summits of at least part of the protuberances of
the said at least one ply of tissue.
According to other features of the method, taken separately or in
combination: the summits of the protuberances of the said at least
part of the protuberances are coated with adhesive before the
joining of the ply of water-soluble material to the said at least
one ply of tissue; the summits of the protuberances of the said at
least part of the protuberances are humidified before the joining
of the ply of water-soluble material to the summits of the
protuberances to cause a local dissolution of the surface of the
ply of water-soluble material upon its contact with the humidified
summits; the surface of the ply of water-soluble material located
opposite the ply of tissue is humidified locally before the joining
of the ply of water-soluble material to the said at least one ply
of tissue; the said surface of the ply of water-soluble material is
humidified at the summits of the protuberances of the said at least
one ply of tissue; the ply of water-soluble material is embossed
before its joining to the said at least one ply of tissue; the ply
of water-soluble material comprises perforations and/or
micro-perforations which are produced before the embossing of the
ply of water-soluble material; the method is suitable for
manufacturing a sheet which comprises at least one first and at
least one second ply of tissue between which the ply of
water-soluble material is arranged, and the ply of water-soluble
material is joined simultaneously to the said at least one first
ply of tissue and to the said at least one second ply of tissue
during an operation for joining the plies.
Other features and advantages of the invention will appear from a
reading of the detailed description that follows, for an
understanding of which reference should be made to the appended
figures in which:
FIG. 1 is a schematic representation of an embossed sheet according
to the invention comprising two plies of tissue and an intermediate
ply of water-soluble material;
FIG. 2 shows a section of the sheet shown in FIG. 1, showing the
protuberances of the plies;
FIG. 3 shows a section of the sheet comprising a single ply of
tissue and one ply of water-soluble material;
FIG. 4 shows a similar section to that of FIG. 2, showing an
alternative embodiment of the invention, for which the ply of
water-soluble material comprises protuberances;
FIG. 5 is a schematic representation of an installation for
producing an embossed sheet according to the invention as shown in
FIG. 3
FIGS. 1, 2 and 3 show a paper product 10 such as an embossed sheet
comprising a plurality of superimposed plies 12, 14
The sheet 10 is, for example, a sheet of bathroom tissue or a
disposable facial tissue.
In a first embodiment shown in FIGS. 1 and 2, the sheet 10
comprises two plies 12 of tissue and one ply 14 prepared from
water-soluble material arranged between the two tissue plies
12.
In a second embodiment shown in FIG. 3, the sheet 10 comprises a
ply 12 of tissue and a ply 14 prepared from water-soluble
material.
It will be understood that the invention is not limited to these
embodiments of the embossed sheet 10, which may comprise a larger
number of plies 12 of tissue and/or a larger number of plies 14 of
water-soluble material.
Furthermore, a ply 12 of tissue may comprise a group of plies
joined together so as to behave like a single ply.
Each ply 12 of tissue is prepared in a conventional manner, for
example by conventional wet pressing called CWP, and its basis
weight is adapted to the use of the sheet, for example the basis
weight of the tissue ply 12 is between 12 and 30 g/m.sup.2.
The ply 14 of water-soluble material is prepared from a material
suitable for being dissolved after prolonged contact with water. It
consists of a plastic, preferably a polyvinyl alcohol (PVA) which
is a polyvinyl acetate (PVAc), that has been hydrolysed to become
water-soluble.
A modification of the hydrolysis rate of the ply 14 of
water-soluble material serves to modify the time required for the
dissolution of the ply 14 of water-soluble material. Thus, it is
possible to adjust this hydrolysis rate according to the desired
properties of the sheet 10.
Preferably, the hydrolysis rate of the plastic is higher than
ninety percent (90%)
Another property of the water-soluble material used to form the ply
14 further consists in that the material is non-porous and is
suitable for forming a sealed barrier to liquids, before its
dissolution.
Thus, the liquids and microorganisms such as bacteria and/or
viruses applied to one surface of the sheet 10 cannot be
transferred to the other surface of the sheet which is, for
example, in contact with the user's hand, thereby serving to ensure
a hygienic use of the sheet 10, in particular when the sheet 10 is
used as a facial tissue or bathroom tissue, as previously
mentioned.
The thickness of the ply 14 of water-soluble material is preferably
lower than 25 .mu.m.
Finally, according to an alternative embodiment of the embossed
sheet 10, the ply 14 of water-soluble material comprises
perforations and/or micro-perforations.
These perforations and/or micro-perforations serve in particular to
increase the absorption rate of the sheet 10 and to improve its
flexibility.
The sheet 10 is an embossed sheet, that is at least one of the
plies 12, 14 comprises at least one embossing pattern.
According to a common definition, embossing is a mechanical
operation of deformation which modifies the relief of a sheet.
According to the embodiments shown in FIGS. 1 to 3, each ply 12 of
tissue comprises an embossing pattern 16 which extends over part of
the surface of the ply 12 and which comprises a plurality of
protuberances 18 oriented inwardly from the sheet 10
Furthermore, according to these embodiments, the ply 14 of
water-soluble material is flat, that is it does not comprise any
embossing pattern
According to the embodiment shown in FIG. 4, the ply 12 of tissue
and the ply 14 of water-soluble material each comprise an embossing
pattern composed of a plurality of protuberances 18, 20.
Here, each ply 12, 14 comprises a single embossing pattern and the
relief of the protuberances caused by the embossing is identical
for the two plies 12, 14.
According to an alternative embodiment, at least one ply 12, 14
comprises a plurality of embossing patterns 16, forming for example
a background pattern and a main pattern.
The height and density of the protuberances 18, 20 of a pattern 16
may be different from the height of the protuberances 18, 20 of the
other pattern 16, thereby serving to procure for the sheet 10
desired properties of softness, absorption and flexibility.
Furthermore, here, the plies 12, 14 are joined together by a
joining mode known by the designation points/points, that is, in
such a way that the summits 18a, 20a of the protuberances of each
of the plies 12, 14 are caused to coincide.
According to an alternative embodiment, not shown, the plies 12, 14
may be joined by the technique called "nested", for which the
protuberances are imbricated.
According to the invention, each ply 12 of tissue is joined to the
ply 14 of water-soluble material at the summits 18a of at least
part of the protuberances 18.
According to a first embodiment of the invention, the joining of
each ply 12 of tissue to the ply 14 of water-soluble material is
carried out by bonding all or part of the summits 18a of the
protuberances 18 of each ply 12 of tissue to the opposite surface
14a of the ply 14 of water-soluble material.
Preferably, the bonding takes place by depositing adhesive on all
or part of the summits 18a of the protuberances 18 before the plies
12, 14 are contacted with one another.
According to a preferred embodiment of the invention, the joining
of each ply 12 of tissue to the ply 14 of water-soluble material is
carried out by partial dissolution of the ply 14 of water-soluble
material, at the summits 18a of the protuberances 18.
The partial dissolution of the ply 14 of water-soluble material is
obtained by locally applying a water-based liquid to the ply 14 of
water-soluble material.
The water-soluble material has the cohesion, or the behaviour, of a
solid when it is dehydrated, and the cohesion of a viscous liquid
when it is hydrated, that is when it is mixed with water.
When the summit 18a of a protuberance of the ply 12 of tissue is in
contact with the partially dissolved zone of the ply 14 of
water-soluble material, the summit 18a absorbs part of the
dissolved water-soluble material. The tissue and the water-soluble
material are thereby mixed.
Then, the two plies are joined together by pressing and then by
natural or forced dehydration so that the contact zones between the
plies 12, 14 become joining zones between the said plies following
the cohesion thereby created
According to a first embodiment, the product used to cause the
partial dissolution of the water-soluble material is exclusively
water, so that the ply 12 of tissue is joined to the ply 14 of
water-soluble material exclusively by the quantity of water-soluble
material that has been dissolved.
According to an alternative embodiment, the product used to cause
the partial dissolution of the water-soluble material consists of a
mixture of water and an additive such as adhesive, which serves to
improve the joining of the ply 12 of tissue to the ply 14 of
water-soluble material.
Furthermore, the quantity of liquid used to cause a local
dissolution of the ply 14 of water-soluble material, is determined
so that only the outer surface of the ply 14 of water-soluble
material is dissolved, that is a central portion, in the thickness
of the ply 14 of water-soluble material, is not dissolved. This
serves in particular to preserve the impermeability function of the
ply 14 of water-soluble material over its whole surface.
Such a feature of dissolution of the ply 14 of water-soluble
material exclusively on the surface is preferably obtained by first
humidifying the summits 18a of the protuberances 18, so that the
quantity of liquid that dissolves the ply 14 of water-soluble
material is limited, and the dissolution occurs when each ply 12 of
tissue is placed in contact with the ply 14 of water-soluble
material.
The ply 14 of water-soluble material is thereby placed in contact
with the bonding liquid for a limited period of time.
When the ply 14 of water-soluble material is arranged between two
plies 12 of tissue, as shown in FIGS. 1 and 2, each surface of the
ply 14 of water-soluble material is joined to a ply 12 of tissue
according to the invention, that is, the ply 14 of water-soluble
material is joined to summits 18a of protuberances 18 of a ply 12
of tissue, which extends inwardly from the sheet 10, towards the
ply 14 of water-soluble material.
By contrast, when the ply 14 of water-soluble material is joined to
a single ply 12 of tissue, as shown in FIGS. 3 and 4, only one
surface of the ply 14 of water-soluble material is joined to the
ply 12 of tissue according to the invention, that is, the surface
of the ply 14 of water-soluble material located opposite the ply 12
of tissue is joined to the summits 18a of all or part of the
protuberances 18 of the said ply 12 of tissue.
FIG. 5 shows an installation for producing a sheet according to the
invention.
This installation is constructed here in order to produce a sheet
10 comprising a single ply 12 of tissue which is embossed, and
comprising a ply 14 of water-soluble material which is flat, as
shown in FIG. 4.
The installation comprises an engraved embossing roller 22 of which
the convex outer cylindrical surface 22a comprises a series of pins
24 formed in relief and of which the form or outer profile is
identical to that which is to be obtained for each corresponding
protuberance 18 of the ply 12 of tissue.
In a manner known per se, the ply 12 of tissue first passes between
the first engraved roller 22 and an associated roller 26 to produce
the embossing pattern of this ply 12. The associated roller 26 may
have a rubber coating or similar, or optionally a rigid coating
having a hardness lower than the hardness of the engraved roller
22.
The ply 12 of tissue then passes in front of the applicator roller
28 belonging to a coating unit 30, of known design, which deposits
a bonding product on the summits 18a of the protuberances 18.
The coating unit 30 serves to deposit the bonding product on all
the summits 18a of the protuberances 18, or on only part of the
summits 18a of the protuberances 18, in particular on the summits
18a of the protuberances 18 which are the highest when the ply of
tissue comprises a plurality of embossing patterns 16 having
different heights.
According to the invention, and as previously described, the
bonding product may be adhesive, water or a mixture of water with a
binder, and is referred to below by the term bonding product.
In a manner known per se, the coating installation comprises an
engraved roller 34, commonly called "anilox", of which the
cylindrical surface comprises cavities (not shown) which are
suitable for being filled with bonding product, during the passage
thereof in front of a tank 36 for then transferring the bonding
product to the applicator roller 28.
The anilox 34 serves to transfer the bonding product in a
predefined and controlled manner onto the applicator roller 28.
This serves to limit the quantity of bonding product in motion.
The cavities of the anilox 34 are preferably such as to have a
volume of between 3 and 40 cm.sup.3/m.sup.2.
The ply 14 of water-soluble material is then placed in contact with
the ply 12 of tissue.
Then, the two plies 12 and 14 pass into a "nip" between the
embossing roller 22 and a roller 32, called marrying roller, to
associate the plies 12, 14 by the pressure of the marrying roller
32 against the embossing roller 22.
Thus, the method for manufacturing an embossed sheet 10 according
to the invention via this installation comprises a first step of
embossing of the ply 12 of tissue, to produce at least one
embossing pattern 16 consisting of protuberances 18 on one surface
of the said ply 12.
This embossing step is implemented by the cooperation of the
engraved roller 22 with the associated roller 26.
This method also comprises a step of joining the ply 12 of tissue
to the ply 14 of water-soluble material, here by cooperation of the
engraved roller 22 with the marrying roller 32.
According to the invention, the step of embossing the ply 12 of
tissue is implemented before the step of joining the ply 12 of
tissue to the ply 14 of water-soluble material. Moreover, also
according to the invention, the bonding step consists in joining
the ply 12 of tissue to the ply 14 of water-soluble material at the
summits 18a of the protuberances 18.
For this purpose, the coating installation 30 deposits the bonding
product before the joining of the ply 12 of tissue to the ply 14 of
water-soluble material.
Thus, when the bonding product is water-based, the ply 14 of
water-soluble material is only locally dissolved when it is placed
in contact with the ply 12 of tissue of which the summits 18a of
the protuberances 18 have been humidified.
This serves to limit and control the extent of the dissolution of
the ply 14 of water-soluble material, so as to avoid weakening its
properties excessively, particularly the impermeability
properties.
According to an alternative embodiment of the method of the
invention, the bonding product is applied to the ply 14 of
water-soluble material, before its joining to the ply 12 of
tissue.
The installation is then modified accordingly, that is, the coating
installation 30 is arranged to apply the bonding product directly
to the ply 14 of water-soluble material.
When the ply 14 of water-soluble material passes opposite the ply
12 of tissue, the latter has been formed to have the properties
previously mentioned, that is, the material has been partly
hydrolysed.
Furthermore, in the case in which the ply 14 of water-soluble
material comprises perforations or micro-perforations, they are
generally produced before the ply 14 of water-soluble material
reaches the installation as described previously.
Preferably, the micro-perforations in the context of the present
invention have a density lower than 150/cm.sup.2 and their diameter
is smaller than 1 mm.
Moreover, according to the embodiment of the embossed sheet 10
according to which the ply 14 of water-soluble material is also
embossed, as shown in FIG. 4, the embossing is carried out before
it is placed in contact with the ply 12 of tissue. For this
purpose, the installation comprises an additional embossing unit
(not shown).
The same applies for manufacturing the embossed sheet shown in FIG.
2, which comprises two plies 12 of tissue between which the ply 14
of water-soluble material is arranged.
The installation then comprises an engraved roller 22 and a coating
unit 30 as described previously, associated with each ply 12 of
tissue.
The ply 14 of water-soluble material is then placed opposite each
of the two plies 12 of tissue, for it to be arranged between
them.
Then, all the plies 12, 14 pass simultaneously in front of the
matching roller 32 in order to associate the ply 14 of
water-soluble material simultaneously with the two plies 12 of
tissue.
The embossed sheet according to the invention thereby procures
better temporary protection in comparison with a "conventional"
sheet, that is one which does not comprise a ply of water-soluble
material, and preserves conventional disintegration properties
after use, that is, when it is discarded into the discharge lines
of sanitary facilities.
The comparative table below shows the results of various
measurements between a multi-ply sheet, for use as bathroom tissue,
of which the design is called "conventional", and which comprises
three plies of tissue, and a multi-ply sheet according to the
invention.
More precisely, the multi-ply sheet called "conventional three-ply
paper" in the table comprises two outer plies of the CWP type and
one central ply having a mechanical strength greater than that of
the two outer plies.
The multi-ply sheet called "invention" in the table is manufactured
according to the invention, and differs from the sheet called
"conventional three-ply paper" only in terms of the central ply,
which consists here of a ply of water-soluble material.
TABLE-US-00001 Conventional three-ply bathroom tissue Invention
Thickness As such 0.354 .+-. 0.006 0.524 .+-. 0.030 (mm) In 12
plies 0.323 .+-. 0.003 0.491 .+-. 0.013 Absorption Capacity 9.3
11.8 (g/g) Time (s) 4 5 Disintegration (s) 8 20 to 25 Strength
(N/m) -- -- MD dry 199 .+-. 7 >899 MD wet 4.7 .+-. 0.7** 8.0
.+-. 1.1 (12.9 .+-. 1.4)** CD dry 81 .+-. 5 281 .+-. 10 CD wet --
-- MD elongation % 19 25 to 73
It appears that all the measured parameters are improved, in
particular the dry strength in the machine direction (MD), cross
direction (CD), and the wet strength in the machine direction (MD)
are improved. The elongation in the machine direction (MD) is also
improved.
Moreover, the "disintegrability" function of the paper according to
the invention is advantageously preserved.
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